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问题 单项选择题

有效射线束宽度与下列哪项无关（）

A.焦点尺寸

B.探测器孔径

C.一次投影射线束通过的路径

D.焦点至探测器的距离和焦外辐射至探测器距离的比值

E.滑环结构

答案

参考答案：E

解析：滑环是螺旋CT设备中的导电装置，与有效射线束宽度无关。

单项选择题

Since your quality process was not up to the four sigma requirements desired by your customer, some of your products were rejected, and there is a potential that you would not get repeat business from the same customer. From a quality perspective. the costs associated with your products being rejected can also be categorized as ______ .

A) cost of conformance
B) customer retention costs
C) failure costs
D) performance cost
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单项选择题

社会主义集体主义原则强调集体利益高于个人利益的同时，也强调 （ ）

A．维护小团体的利益

B．先私后公，先己后人

C．压制个人，束缚个性

D．重视、保障和发展个人的正当利益
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